Okay, so start with the aspects "less positive": (1) requiring a brightness relative darkness, (2) avoid getting too far from the projection surface (3) provided the bag may contain only the projector, but neither the charger nor the cable connection to the computer is damaged, (4) relatively noisy (but if you have a helmet, whatever ...)
Apart from that, the positives: good resolution, full connections (USB, VGA, HDMI), several combinations of predefined parameters that allow for an optimal depending on the context (presentation, movie, console ...) ability to store data on the projector ...